Radio Amateur Club of TU Wien

Main mast serviced

Stronger winds may excite torsional oscillations of the BigLift mast. Recent oscillations were so strong that both M4 screws sheared off. When the screws are torn, the mast may rotat freely in the wind which saves the mast from damage, but prevents controlled rotation of the antenna.

Today, both screws were replaced (M4 x 20, steel countersunk screw) and the SteppIR DB-36 is lifted to its operational height again.